void setup(){

}
void loop(){
  for (int i = 0; i <= 255; i = i + (10)) {
    analogWrite(5,i);
    analogWrite(6,i);
    delay(20);
  }
  for (int i = 255; i >= 0; i = i + (-10)) {
    analogWrite(5,i);
    analogWrite(6,i);
    delay(20);
  }
}
